//身份证省的编码
let idCityCode = {
	11: "北京", 12: "天津", 13: "河北", 14: "山西", 15: "内蒙古",
	21: "辽宁", 22: "吉林", 23: "黑龙江", 31: "上海", 32: "江苏",
	33: "浙江", 34: "安徽", 35: "福建", 36: "江西", 37: "山东", 41: "河南",
	42: "湖北", 43: "湖南", 44: "广东", 45: "广西", 46: "海南", 50: "重庆",
	51: "四川", 52: "贵州", 53: "云南", 54: "西藏", 61: "陕西", 62: "甘肃",
	63: "青海", 64: "宁夏", 65: "新疆", 71: "台湾", 81: "香港", 82: "澳门", 91: "国外"
};
	
/**
 * 取身份证前两位,校验省份
 */
export function checkIDCard_province(card) {
	var province = card.substr(0, 2);
	if (idCityCode[province] == undefined) {
		return false;
	}
	return true;
}

/**
 * 校验身份证中生日是否正确
 */
export function checkIDCard_birthday(card) {
    var len = card.length;
    //身份证15位时，次序为省（3位）市（3位）年（2位）月（2位）日（2位）校验位（3位），皆为数字
    if (len == 15) {
        var re_fifteen = /^(\d{6})(\d{2})(\d{2})(\d{2})(\d{3})$/;
        var arr_data = card.match(re_fifteen);
        var year = arr_data[2];
        var month = arr_data[3];
        var day = arr_data[4];
        var birthday = new Date('19' + year + '/' + month + '/' + day);
        return verifyBirthday('19' + year, month, day, birthday);
    }
    //身份证18位时，次序为省（3位）市（3位）年（4位）月（2位）日（2位）校验位（4位），校验位末尾可能为X
    if (len == 18) {
        var re_eighteen = /^(\d{6})(\d{4})(\d{2})(\d{2})(\d{3})([0-9]|X|x)$/;
        var arr_data = card.match(re_eighteen);
        var year = arr_data[2];
        var month = arr_data[3];
        var day = arr_data[4];
        var birthday = new Date(year + '/' + month + '/' + day);
        return verifyBirthday(year, month, day, birthday);
    }
    return false;
}

/**
 * 校验日期
 */
export function verifyBirthday(year, month, day, birthday) {
    var now = new Date();
    var now_year = now.getFullYear();
    //年月日是否合理
    if (birthday.getFullYear() == year && (birthday.getMonth() + 1) == month && birthday.getDate() == day) {
        //判断年份的范围（3岁到100岁之间)
        var time = now_year - year;
        if (time >= 3 && time <= 100) {
            return true;
        }
        return false;
    }
    return false;
}

/**
 * 身份证号码最后一位，检验位的检测
 */
export function checkParity(card) {
    //15位转18位
    card = changeFivteenToEighteen(card);
    if (card.length == 18) {
        card = card.split('');
        //∑(ai×Wi)(mod 11)
        //加权因子
        var factor = [ 7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2 ];
        //校验位
        var parity = [ 1, 0, 'X', 9, 8, 7, 6, 5, 4, 3, 2 ];
        var sum = 0;
        var ai = 0;
        var wi = 0;
        for (var i = 0; i < 17; i++) {
            ai = card[i];
            wi = factor[i];
            sum += ai * wi;
        }
        var last = parity[sum % 11];
        if(last == card[17].toUpperCase()){
            return true;
        }
    }
    return false;
}

/**
 * 15位转18位身份证号
 */
export function changeFivteenToEighteen(card) {
    if (card.length == '15') {
        var arrInt = [7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2];
        var arrCh = ['1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2'];
        var cardTemp = 0, i;
        card = card.substr(0, 6) + '19' + card.substr(6, card.length - 6);
        for (i = 0; i < 17; i++) {
            cardTemp += card.substr(i, 1) * arrInt[i];
        }
        card += arrCh[cardTemp % 11];
        return card;
    }
    return card;
}